Think of an octopus or a squid that lives in a large, round shell and then you'll understand what a Chambered Nautilus is like. This creature has the ability to take water into a sac in its body, and then expel this water quickly, creating a cool method of propulsion. By using this type of movement the Chambered Nautilus moves shell-first through the water. So this undersea animal never actually sees where it's going, only the places where it's been. This shell has been polished to remove the outer layer of the shell to show the pearly inside layers.
The Children's Museum of Indianapolis
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